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    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 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class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 更多功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 单元测试</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/vdoing-demo-repository/pages/df36888424843793/" class="sidebar-link">前言</a></li><li><a href="/vdoing-demo-repository/pages/bf5c625a35757b37/" class="sidebar-link">Jest 安装和配置</a></li><li><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/" aria-current="page" class="active sidebar-link">辅助模块单元测试</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#准备工作" class="sidebar-link">准备工作</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#util-模块测试" class="sidebar-link">util 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#cookie-模块测试" class="sidebar-link">cookie 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#data-模块测试" class="sidebar-link">data 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#error-模块测试" class="sidebar-link">error 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#headers-模块测试" class="sidebar-link">headers 模块测试</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/13f147a9b355c4c1/#url-模块测试" class="sidebar-link">url 模块测试</a></li></ul></li><li><a href="/vdoing-demo-repository/pages/e1d15dec8634e6b5/" class="sidebar-link">请求模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/ddd86ec39b5dfe33/" class="sidebar-link">headers 模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/2eac7a0a0d644c15/" class="sidebar-link">Axios 实例模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/97de6fd6293a2c6e/" class="sidebar-link">拦截器模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/cdf59840306f9e81/" class="sidebar-link">mergeConfig 模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/6fa16aee29527032/" class="sidebar-link">请求取消模块单元测试</a></li><li><a href="/vdoing-demo-repository/pages/9572134781ba6a25/" class="sidebar-link">剩余模块单元测试</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/vdoing-demo-repository/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/vdoing-demo-repository/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/vdoing-demo-repository/note/typescript-axios/#ts-axios 单元测试" data-v-06225672>ts-axios 单元测试</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="">辅助模块单元测试<!----></h1> <!----> <div class="theme-vdoing-content content__default"><h1 id="辅助模块单元测试"><a href="#辅助模块单元测试" class="header-anchor">#</a> 辅助模块单元测试</h1> <h2 id="准备工作"><a href="#准备工作" class="header-anchor">#</a> 准备工作</h2> <p>通常我们会优先为一个库的辅助方法编写测试，我们会优先为 <code>ts-axios</code> 库的 <code>helpers</code> 目录下的模块编写测试。我们在 <code>test</code> 目录下创建一个 <code>helpers</code> 目录，创建一个 <code>boot.ts</code> 空文件，这个是因为我们上节课给 Jest 配置了 <code>setupFilesAfterEnv</code> 指向了这个文件，后面的章节我们会编写这个文件。</p> <p>然后我们可以在控制台运行 <code>npm test</code>，它实际上是执行了 <code>jest --coverage</code> 来跑单元测试，我们会发现它会报错，没有匹配的测试文件，那是因为我们还没有在 <code>test</code> 目录下编写任何一个 .spec.ts 结尾的测试文件。接下来我们就来为这些辅助模块编写相应的测试。</p> <h2 id="util-模块测试"><a href="#util-模块测试" class="header-anchor">#</a> util 模块测试</h2> <p><code>test/helpers/util.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span>
  isDate<span class="token punctuation">,</span>
  isPlainObject<span class="token punctuation">,</span>
  isFormData<span class="token punctuation">,</span>
  isURLSearchParams<span class="token punctuation">,</span>
  extend<span class="token punctuation">,</span>
  deepMerge
<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/util'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:util'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isXX'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate Date'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isDate</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isDate</span><span class="token punctuation">(</span>Date<span class="token punctuation">.</span><span class="token function">now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate PlainObject'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isPlainObject</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate FormData'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">FormData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should validate URLSearchParams'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSearchParams</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSearchParams</span><span class="token punctuation">(</span><span class="token string">'foo=1&amp;bar=2'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'extend'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should be mutable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
      <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>

      <span class="token function">extend</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>a<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">123</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should extend properties'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span><span class="token punctuation">,</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">extend</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">123</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">789</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'deepMerge'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should be immutable'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
      <span class="token keyword">const</span> b<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> c<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>

      <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> a<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> a<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> b<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token keyword">typeof</span> c<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'undefined'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should deepMerge properties'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> d <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">,</span> c<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>d<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">789</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>d<span class="token punctuation">.</span>bar<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">456</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should deepMerge recursively'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> baz<span class="token operator">:</span> <span class="token number">456</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> bar<span class="token operator">:</span> <span class="token punctuation">{</span> qux<span class="token operator">:</span> <span class="token number">789</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        foo<span class="token operator">:</span> <span class="token punctuation">{</span>
          bar<span class="token operator">:</span> <span class="token number">123</span><span class="token punctuation">,</span>
          baz<span class="token operator">:</span> <span class="token number">456</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        bar<span class="token operator">:</span> <span class="token punctuation">{</span>
          qux<span class="token operator">:</span> <span class="token number">789</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should remove all references from nested objects'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token punctuation">{</span> bar<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span>
      <span class="token keyword">const</span> b <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
      <span class="token keyword">const</span> c <span class="token operator">=</span> <span class="token function">deepMerge</span><span class="token punctuation">(</span>a<span class="token punctuation">,</span> b<span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        foo<span class="token operator">:</span> <span class="token punctuation">{</span>
          bar<span class="token operator">:</span> <span class="token number">123</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>c<span class="token punctuation">.</span>foo<span class="token punctuation">)</span><span class="token punctuation">.</span>not<span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>a<span class="token punctuation">.</span>foo<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should handle null and undefined arguments'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token keyword">undefined</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">deepMerge</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token number">123</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br></div></div><p>其中 <a href="https://jestjs.io/docs/en/api#describename-fn" target="_blank" rel="noopener noreferrer"><code>describe</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 方法用来定义一组测试，它可以支持嵌套，<a href="https://jestjs.io/docs/en/api#testname-fn-timeout" target="_blank" rel="noopener noreferrer"><code>test</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 函数是用来定义单个测试用例，它是测试的最小单元。<a href="https://jestjs.io/docs/en/expect#expectvalue" target="_blank" rel="noopener noreferrer"><code>expect</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 是断言函数，所谓&quot;断言&quot;，就是判断代码的实际执行结果与预期结果是否一致，如果不一致就抛出一个错误。</p> <p>测试文件编写好后，我们可以去控制台运行一次 <code>npm test</code>，看一下测试结果，我们可以看跑了几个测试文件，测试是否通过，测试覆盖率等。</p> <h2 id="cookie-模块测试"><a href="#cookie-模块测试" class="header-anchor">#</a> cookie 模块测试</h2> <p><code>test/helpers/cookie.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> cookie <span class="token keyword">from</span> <span class="token string">'../../src/helpers/cookie'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:cookie'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should read cookies'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    document<span class="token punctuation">.</span>cookie <span class="token operator">=</span> <span class="token string">'foo=baz'</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'baz'</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return null if cookie name is not exist'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    document<span class="token punctuation">.</span>cookie <span class="token operator">=</span> <span class="token string">'foo=baz'</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span><span class="token string">'bar'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p>这里我们可以通过 <code>document.cookie</code> 去设置 cookie，就像在浏览器里一样操作。</p> <h2 id="data-模块测试"><a href="#data-模块测试" class="header-anchor">#</a> data 模块测试</h2> <p><code>test/helpers/data.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> transformRequest<span class="token punctuation">,</span> transformResponse <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/data'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:data'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'transformRequest'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should transform request data to string if data is a PlainObject'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformRequest</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'{&quot;a&quot;:1}'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is not a PlainObject'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'a=b'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformRequest</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'transformResponse'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should transform response data to Object if data is a JSON string'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token string">'{&quot;a&quot;: 2}'</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">2</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is a string but not a JSON string'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token string">'{a: 2}'</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'{a: 2}'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if data is not a string'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> a <span class="token operator">=</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">2</span> <span class="token punctuation">}</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">transformResponse</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>a<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br></div></div><h2 id="error-模块测试"><a href="#error-模块测试" class="header-anchor">#</a> error 模块测试</h2> <p><code>test/helpers/error.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> createError <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/error'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> AxiosRequestConfig<span class="token punctuation">,</span> AxiosResponse <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/types'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers::error'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should create an Error with message, config, code, request, response and isAxiosError'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token keyword">const</span> config<span class="token operator">:</span> AxiosRequestConfig <span class="token operator">=</span> <span class="token punctuation">{</span> method<span class="token operator">:</span> <span class="token string">'post'</span> <span class="token punctuation">}</span>
    <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
      status<span class="token operator">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
      statusText<span class="token operator">:</span> <span class="token string">'OK'</span><span class="token punctuation">,</span>
      headers<span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
      request<span class="token punctuation">,</span>
      config<span class="token punctuation">,</span>
      data<span class="token operator">:</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token string">'bar'</span> <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">const</span> error <span class="token operator">=</span> <span class="token function">createError</span><span class="token punctuation">(</span><span class="token string">'Boom!'</span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token string">'SOMETHING'</span><span class="token punctuation">,</span> request<span class="token punctuation">,</span> response<span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error <span class="token keyword">instanceof</span> <span class="token class-name">Error</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Boom!'</span><span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>config<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>code<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'SOMETHING'</span><span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>request<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>request<span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>response<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span>isAxiosError<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><p>该模块跑完我们会发现，分支覆盖率是在 <code>50%</code>，因为第十七行代码</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">super</span><span class="token punctuation">(</span>message<span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这个是 <code>super</code> 继承对测试覆盖率支持的坑，目前没有好的解决方案，可以先忽略。</p> <h2 id="headers-模块测试"><a href="#headers-模块测试" class="header-anchor">#</a> headers 模块测试</h2> <p><code>test/helpers/headers.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> parseHeaders<span class="token punctuation">,</span> processHeaders<span class="token punctuation">,</span> flattenHeaders <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/headers'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:header'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'parseHeaders'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should parse headers'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> parsed <span class="token operator">=</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>
        <span class="token string">'Content-Type: application/json\r\n'</span> <span class="token operator">+</span>
          <span class="token string">'Connection: keep-alive\r\n'</span> <span class="token operator">+</span>
          <span class="token string">'Transfer-Encoding: chunked\r\n'</span> <span class="token operator">+</span>
          <span class="token string">'Date: Tue, 21 May 2019 09:23:44 GMT\r\n'</span> <span class="token operator">+</span>
          <span class="token string">':aa\r\n'</span> <span class="token operator">+</span>
          <span class="token string">'key:'</span>
      <span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'content-type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'application/json'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'connection'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'keep-alive'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'transfer-encoding'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'chunked'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'date'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Tue, 21 May 2019 09:23:44 GMT'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>parsed<span class="token punctuation">[</span><span class="token string">'key'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return empty object if headers is empty string'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">parseHeaders</span><span class="token punctuation">(</span><span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'processHeaders'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should normalize Content-Type header name'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span>
        <span class="token string-property property">'conTenT-Type'</span><span class="token operator">:</span> <span class="token string">'foo/bar'</span><span class="token punctuation">,</span>
        <span class="token string-property property">'Content-length'</span><span class="token operator">:</span> <span class="token number">1024</span>
      <span class="token punctuation">}</span>
      <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'foo/bar'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'conTenT-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-length'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token number">1024</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should set Content-Type if not set and data is PlainObject'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
      <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token punctuation">{</span> a<span class="token operator">:</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'application/json;charset=utf-8'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should set not Content-Type if not set and data is not PlainObject'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> headers<span class="token operator">:</span> <span class="token builtin">any</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span>
      <span class="token function">processHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'a=b'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if headers is undefined or null'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">processHeaders</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">processHeaders</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'flattenHeaders'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should flatten the headers and include common headers'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> headers <span class="token operator">=</span> <span class="token punctuation">{</span>
        Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
        common<span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token string-property property">'X-COMMON-HEADER'</span><span class="token operator">:</span> <span class="token string">'commonHeaderValue'</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        get<span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span>
        post<span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token string-property property">'X-POST-HEADER'</span><span class="token operator">:</span> <span class="token string">'postHeaderValue'</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span>

      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token string">'get'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
        <span class="token string-property property">'X-COMMON-HEADER'</span><span class="token operator">:</span> <span class="token string">'commonHeaderValue'</span><span class="token punctuation">,</span>
        <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should flatten the headers without common headers'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> headers <span class="token operator">=</span> <span class="token punctuation">{</span>
        Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
        get<span class="token operator">:</span> <span class="token punctuation">{</span>
          <span class="token string-property property">'X-GET-HEADER'</span><span class="token operator">:</span> <span class="token string">'getHeaderValue'</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span>

      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span>headers<span class="token punctuation">,</span> <span class="token string">'patch'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
        Accept<span class="token operator">:</span> <span class="token string">'application/json'</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should do nothing if headers is undefined or null'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span><span class="token keyword">undefined</span><span class="token punctuation">,</span> <span class="token string">'get'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">flattenHeaders</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token string">'post'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeNull</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br></div></div><p>运行后，我们会发现 <code>parseHeaders</code> 测试组的 <code>should parse headers</code> 测试没通过，<code>expect(parsed['date']).toBe('Tue, 21 May 2019 09:23:44 GMT')</code> 我们期望解析后的 <code>date</code> 字段是 <code>Tue, 21 May 2019 09:23:44 GMT</code>，而实际的值是 <code>Tue, 21 May 2019 09</code>。</p> <p>测试没通过，我们检查一下代码，发现我们 <code>parseHeaders</code> 的代码逻辑漏洞，我们只考虑了第一个 &quot;:&quot; 号，没考虑后半部分的字符串内部也可能有 &quot;:&quot;，按我们现有的逻辑就会把字符串中 &quot;:&quot; 后面部分都截断了。</p> <p>因此我们修改 <code>parseHeaders</code> 的实现逻辑。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>headers<span class="token operator">:</span> <span class="token builtin">string</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">any</span> <span class="token punctuation">{</span>
  <span class="token keyword">let</span> parsed <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>headers<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> parsed
  <span class="token punctuation">}</span>

  headers<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">'\r\n'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>line <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> <span class="token punctuation">[</span>key<span class="token punctuation">,</span> <span class="token operator">...</span>vals<span class="token punctuation">]</span> <span class="token operator">=</span> line<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">':'</span><span class="token punctuation">)</span>
    key <span class="token operator">=</span> key<span class="token punctuation">.</span><span class="token function">trim</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>key<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">return</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">let</span> val <span class="token operator">=</span> vals<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">':'</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">trim</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    parsed<span class="token punctuation">[</span>key<span class="token punctuation">]</span> <span class="token operator">=</span> val
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token keyword">return</span> parsed
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br></div></div><p>这样我们再重新跑测试，就会通过了。</p> <h2 id="url-模块测试"><a href="#url-模块测试" class="header-anchor">#</a> url 模块测试</h2> <p><code>test/helpers/url.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> buildURL<span class="token punctuation">,</span> isAbsoluteURL<span class="token punctuation">,</span> combineURL<span class="token punctuation">,</span> isURLSameOrigin <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/helpers/url'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'helpers:url'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'buildURL'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support null params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          foo<span class="token operator">:</span> <span class="token string">'bar'</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should ignore if some param value is null'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          foo<span class="token operator">:</span> <span class="token string">'bar'</span><span class="token punctuation">,</span>
          baz<span class="token operator">:</span> <span class="token keyword">null</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should ignore if the only param value is null'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          baz<span class="token operator">:</span> <span class="token keyword">null</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support object params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          foo<span class="token operator">:</span> <span class="token punctuation">{</span>
            bar<span class="token operator">:</span> <span class="token string">'baz'</span>
          <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo='</span> <span class="token operator">+</span> <span class="token function">encodeURI</span><span class="token punctuation">(</span><span class="token string">'{&quot;bar&quot;:&quot;baz&quot;}'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support date params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> date <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          date<span class="token operator">:</span> date
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?date='</span> <span class="token operator">+</span> date<span class="token punctuation">.</span><span class="token function">toISOString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support array params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          foo<span class="token operator">:</span> <span class="token punctuation">[</span><span class="token string">'bar'</span><span class="token punctuation">,</span> <span class="token string">'baz'</span><span class="token punctuation">]</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo[]=bar&amp;foo[]=baz'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support special char params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          foo<span class="token operator">:</span> <span class="token string">'@:$, '</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=@:$,+'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support existing params'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          bar<span class="token operator">:</span> <span class="token string">'baz'</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar&amp;bar=baz'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should correct discard url hash mark'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>
        <span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar#hash'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          query<span class="token operator">:</span> <span class="token string">'baz'</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar&amp;query=baz'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should use serializer if provided'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> serializer <span class="token operator">=</span> jest<span class="token punctuation">.</span><span class="token function">fn</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token string">'foo=bar'</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token keyword">const</span> params <span class="token operator">=</span> <span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token string">'bar'</span> <span class="token punctuation">}</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> params<span class="token punctuation">,</span> serializer<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?foo=bar'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>serializer<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toHaveBeenCalled</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>serializer<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toHaveBeenCalledWith</span><span class="token punctuation">(</span>params<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should support URLSearchParams'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">buildURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">URLSearchParams</span><span class="token punctuation">(</span><span class="token string">'bar=baz'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'/foo?bar=baz'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isAbsoluteURL'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return true if URL begins with valid scheme name'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'custom-scheme-v1.0://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'HTTP://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return false if URL begins with invalid scheme name'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'123://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'!valid://example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return true if URL is protocol-relative'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'//example.com/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should return false if URL is relative'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isAbsoluteURL</span><span class="token punctuation">(</span><span class="token string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'combineURL'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should combine URL'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com'</span><span class="token punctuation">,</span> <span class="token string">'/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should remove duplicate slashes'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/'</span><span class="token punctuation">,</span> <span class="token string">'/users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should insert missing slash'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com'</span><span class="token punctuation">,</span> <span class="token string">'users'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should not insert slash when relative url missing/empty'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">,</span> <span class="token string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should allow a single slash for relative url'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">combineURL</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users'</span><span class="token punctuation">,</span> <span class="token string">'/'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'https://api.github.com/users/'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'isURLSameOrigin'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should detect same origin'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span>window<span class="token punctuation">.</span>location<span class="token punctuation">.</span>href<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should detect different origin'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span><span class="token string">'https://github.com/axios/axios'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span 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class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br><span class="line-number">136</span><br><span class="line-number">137</span><br><span class="line-number">138</span><br><span class="line-number">139</span><br><span class="line-number">140</span><br><span class="line-number">141</span><br><span class="line-number">142</span><br><span class="line-number">143</span><br><span class="line-number">144</span><br><span class="line-number">145</span><br><span class="line-number">146</span><br><span class="line-number">147</span><br><span class="line-number">148</span><br><span class="line-number">149</span><br><span class="line-number">150</span><br><span class="line-number">151</span><br><span class="line-number">152</span><br><span class="line-number">153</span><br><span class="line-number">154</span><br></div></div><p>这里要注意的是，我们使用了 <a href="https://jestjs.io/docs/en/jest-object#jestfnimplementation" target="_blank" rel="noopener noreferrer"><code>jest.fn</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 去模拟了一个函数，这个也是在编写 Jest 测试中非常常用的一个 API。</p> <p>至此，我们就实现了 <code>ts-axios</code> 库 <code>helpers</code> 目录下所有模块的测试，并把该目录下的测试覆盖率达到了近乎 100% 的覆盖率。下面的章节我们就开始测试 <code>ts-axios</code> 的核心流程，针对不同的 <code>feature</code> 去编写单元测试了。</p></div></div> <!----> <div class="page-edit"><div class="edit-link"><a href="https://github.com/xugaoyi/vuepress-theme-vdoing/edit/master/docs/《TypeScript 从零实现 axios》/11.ts-axios 单元测试/03.辅助模块单元测试.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <!----></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a 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